Explanation

Light Year is the distance that light can travel in one year.

The distance light travels in one year is known as light year.

Explanation

Sirius is the brightest star in the night sky.

Sirius means صبح کا ستارہ 

Explanation

• The de-oxygenated blood from the heart comes to the lungs through the Pulmonary artery
  ***
• The deoxygenated blood returns from the body to the right atrium and from there enter the right ventricle that pumps it to the lungs through the main pulmonary artery (pulmonary trunk).
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• The pulmonary veins transport oxygenated blood back to the heart from the lungs
  

Explanation

The SI unit of electric resistance is the ohm (Ω).

1 Ω = 1 V/A.

while

The SI unit of resistivity is an ohm-meter.

Explanation

• In a parallel circuit, if one bulb blows, the other bulb will remain the same.
• This is because each bulb in a parallel circuit has its own independent path to the power source.
• The failure of one bulb does not affect the current flowing through the other bulb's path.

Explanation

the mass of the proton is almost 1836 times heavier than that of an electron.

while

A neutron is 1842 times heavier than an electron.

ND25-2-2023

Explanation

Osmosis is a specific type of diffusion; it is the passage of water from a region of high water.

Explanation

The Milky Way is the galaxy that contains our solar system

It consists of 100–400 billion stars

The Milky Way is a huge collection of: 

• stars
• dust
• gas

It is visible as a hazy band of white light

Additional Information

The nearest galaxy to our Milky Way is Andromeda

Largest galaxy in the Universe is a Spiral galaxy 

Explanation

The nucleus is primarily composed of protons and neutrons, collectively called nucleons.

Explanation

• The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom.
• Consider the table below, which shows data from the first six elements of the periodic table.
• Consider the element helium.
• Its atomic number is 2, so it has two protons in its nucleus.